335 research outputs found
Complex scaling method for three- and four-body scattering above the break-up thresholds
A formalism based on the complex-scaling method is presented to solve the few
particle scattering problem in configuration space using bound state techniques
with trivial boundary conditions. Several applications to A=3,4 systems are
presented to demonstrate the efficiency of the method in computing elastic as
well as break-up reactions with Hamiltonians including both short and
long-range interaction.Comment: FB20 conference proceeding
Modelling double charge exchange response function for tetraneutron system
This work is an attempt to model the response function of a recent RIKEN
experimental study of the double charge exchange He(He,Be)n
reaction in order to put in evidence an eventual enhancement mechanism of the
zero energy cross section, including a near-threshold resonance. This resonance
can indeed be reproduced only by adding to the standard nuclear Hamiltonian an
unphysically large T=3/2 attractive 3n-force which destroys the neighboring
nuclear chart. No other mechanisms like cusps or related structures were found
Solutions of the Wick-Cutkosky model in the Light-Front Dynamics
We study relativistic effects in a system of two scalar particles interacting
via a scalar exchange in the Light Front Dynamcis framework. The results are
compared to those provided by Bethe-Salpeter and non relativistic equations. It
is found in particular that for massive exchange, the relativistic description
is of crucial importance even in the limit of zero binding energy.
PACS: 11.10, 03.70, 03.65P Keywords: Light-Front Dynamics, Relativistic
equations, Quantum Field TheoryComment: 12 pages, 11 figures, Latex.tar.gz file Accepted in Phys. Lett.
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Abstract not availabl
Chordal cubil systems
We classify the phase portraits of the cubic systems in the plane such that they do not have finite critical points, and the critical points on the equator of the Poincaré sphere are isolated and have linear part nonidentically zero
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